I watched Mike from AC do one on a car at MOTD 8 and he did not remove the piece. Contact Mishka (a member here) as it was his car and he helped.
Jim
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N2MINI MINI of the Month
I put checkers across mine myself, and didn't remove that piece or the attenna but it would have been alittle easy if I had. The whole piece I have no idea how to get it off and not sure it would be easy to do. The attenna probably has a bolt behind your interior light switches which is just under the attenna on the inside of course.. You can take a credit card and slide in between a middle section of it and pop it open, and you should be able to get to it from there I'd think...